LayoutTests/accessibility/content-editable.html

<html>
<head>
<script src="../resources/accessibility-helper.js"></script>
<script src="../resources/js-test.js"></script>
</head>
<body id="body" contenteditable role="group">

Some Text.

<script>
let output = "This test ensures that the body element has a writable AXValue because it has a contenteditable attribute.\n\n";
if (window.accessibilityController) {
    var body = document.getElementById("body");
    body.focus();
    body = accessibilityController.focusedElement;

    output += expect("body.isAttributeSettable('AXValue')", "true");
    debug(output);
}
</script>
</body>
</html>